@charset "UTF-8";
@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(180deg);
  }
}

.nav_center ul li .arrow {
  display: inline-block;
  transition: transform 0.3s ease;
}

.nav_center ul li:hover .arrow {
  animation: rotate 0.3s forwards;
}

.nav_center ul li .arrow {
  display: inline-block;
  transition: transform 0.3s ease;
}

.nav_center ul li:hover .arrow {
  transform: rotate(180deg);
}

.nav_header {
  width: 100%;
  height: 100%;
  display: flex;
}

.nav_header .nav_left {
  width: 10%;
  height: 100%;
}

.nav_header .nav_left img {
  width: 130px;
  height: 56px;
  padding-top: 6px;
  margin-left: 30px;
}

.nav_header .nav_center {
  width: 40%;
  height: 70px;
  line-height: 70px;
  display: flex;
}

.nav_header .nav_center ul li {
  float: left;
  margin-left: 30px;
  position: relative;
}

.nav_header .nav_center ul li .dandan {
  position: absolute;
  height: 500px;
  width: 850px;
  left: 0;
  top: 70px;
  background-color: white;
  border-radius: 20px;
  visibility: hidden;
  /* 初始状态 */
  opacity: 0;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.nav_header .nav_center ul li .dandan .name {
  color: #000;
}

.nav_header .nav_center ul li:hover .dandan {
  visibility: visible;
  /* 显示 */
  opacity: 1;
  /* 渐变为不透明 */
}

.nav_header .nav_center ul li .arrow {
  transition: transform 0.3s ease;
}

.nav_header .nav_center li:hover {
  color: orange;
}

.nav_header .nav_center .seach {
  margin-top: 15px;
  width: 380px;
  height: 34px;
  border: 1px solid #ccc;
  margin-left: 40px;
  border-radius: 5px;
  font-size: 12px;
  display: flex;
  line-height: 34px;
}

.nav_header .nav_right {
  width: 50%;
  height: 100%;
  font-size: 14px;
  display: flex;
  align-items: center;
}

.nav_header .nav_right ul {
  margin-left: 270px;
}

.nav_header .nav_right ul li {
  float: left;
  display: flex;
  align-items: center;
  margin-left: 30px;
}

.nav_header .nav_right ul li img {
  width: 24px;
  height: 27px;
}

.nav_header .nav_right ul li:hover {
  color: orange;
}

.nav_header .nav_right .user {
  width: 200px;
  height: 100%;
  display: flex;
  align-items: center;
  line-height: 10px;
  font-size: 16px;
  margin-left: 20px;
}

.nav_header .nav_right .user img {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  margin-left: 30px;
}

.nav_header .nav_right .user .bold {
  float: right;
  line-height: 40px;
}

.nav_header .nav_right .user .tou {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  margin-left: 30px;
}

.nav_header .nav_right .user .bold:hover {
  font-weight: bold;
  color: #000;
}
